An optimization method for gate valve disc profile that can accelerate closing

Abstract

The present invention discloses a method for optimizing the disc profile of a gate valve that can accelerate closing, and belongs to the field of industrial valve design. The method comprises the following steps: establishing a three-dimensional model according to the two-dimensional engineering drawing of the gate valve, and extracting a flow channel model; using meshing software to discretize the flow channel model into a grid model; using fluid analysis software to calculate the grid model, realize the visualization of the flow field inside the valve, and determine the streamline distribution; defining the structural parameters according to the design method, and optimizing the disc profile. The present invention can greatly reduce the response time of the gate valve from fully open to fully closed, improve the performance of the gate valve; avoid most assumptions and complex calculations, so that the results are more reliable; reduce the design cost, and avoid repeated manufacturing of prototypes for testing.

Description

Technical Field

[0001] The invention belongs to the field of industrial valve design, and in particular relates to a method for optimizing a gate valve disc profile capable of accelerating closing. Background Art

[0002] A gate valve is a valve that controls the flow of fluid by displacing the gate. The valve position of a large-caliber, large-flow gate valve generally has only two states: fully open and fully closed. Closing response time is a key parameter of a gate valve. Large gate valves often perform fully closed operations under extreme conditions of high temperature and high pressure, which requires fast and accurate operation. If the gate valve fails to achieve a fast response from fully open to fully closed, it will significantly reduce the safety of the entire process system and form potential accident hazards. Some foreign countries with developed heavy industries have specially established large hydraulic testing laboratories to test gate valves that are about to be put into important fields, such as nuclear power main steam gate valves. After a series of tests, optimizations, and re-tests, it can be determined that the closing response time of the gate valve meets the standard. However, the gate valves provided by existing valve manufacturers in China still have a lot of room for improvement in the field of closing response time parameters, and because there is a lack of high-tech laboratories in China that can provide experimental platforms for large gate valves, the entire testing process is time-consuming and labor-intensive. Therefore, it is of great practical significance to propose an optimization method for the disc profile of a gate valve that can reduce the closing response time. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a method for optimizing the gate valve disc profile that can accelerate closing. The existing gate valve disc profiles are all planes. The present invention starts with the optimization of the gate valve disc profile and innovatively adopts the design concept of the curved surface; at the same time, based on the method of numerical simulation, a complete design process is proposed to obtain the optimal values ​​of the key parameters of the curved surface. The present invention is based on numerical simulation, that is, relying on electronic computers, combined with finite element method or finite volume method to establish mathematical models, and solve engineering physics problems and solve approximate solutions.

[0004] The specific technical solutions adopted by the present invention are as follows:

[0005] The present invention provides a method for optimizing the profile of a gate valve disc capable of accelerating closing, which is specifically as follows:

[0006] S1: Establish a three-dimensional model of the gate valve to be optimized when the valve opening is maximum, extract the flow channel model in the valve and discretize it into a grid model; use fluid analysis software, based on the grid model, assign fluid properties to the medium in the valve, set inlet and outlet boundary conditions, take the vertical downward mechanical transmission force on the valve stem as the independent variable, set the height of the lower end of the valve disc from the bottom of the valve seat as the dependent variable, set the turbulence model for fluid calculation, set the outer wall surface of the valve disc as the fixed slip surface, and the outer wall surface and symmetry surface of the valve stem as the reconstruction surface, set the dynamic grid method, update step size and monitoring time point, and obtain the dynamic grid model;

[0007] S2: Calculate the dynamic mesh model through fluid analysis software, and after the calculation converges, output the following content: the time taken for the valve disc to return to its seat, the downward displacement, velocity and acceleration of the outer wall of the valve disc, the fluid velocity data in the flow channel during the whole process, and the data of the hydraulic force distribution on the outer surface of the valve disc impacted by the fluid; draw a velocity cloud map on the longitudinal symmetry plane of the mesh model that changes with time through post-processing software, and draw a streamline map based on the time-velocity cloud map;

[0008] S3: Define the projection height from a point in the gate valve 3D model to the valve seat as H, and the height of the top of the inlet flow channel as a constant H in According to the downward displacement, velocity and acceleration of the outer wall of the valve disc obtained in step S2, the time when the valve disc acceleration is the maximum is t i The height H between the lower end of the valve disc and the bottom of the valve seat Pi , where the initial value of i is 1;

[0009] S4: Based on the results of steps S2 and S3, when the time is t i According to the data of hydraulic force distribution on the outer surface of the valve disc impacted by the fluid, the height H of the lower end of the valve disc from the bottom of the valve seat is obtained. Pi When the valve disc is subjected to the impact force of the fluid medium, the resultant force point position A 合 ; The distance from the resultant point to the central axis is D i , the projected height to the bottom of the valve seat is H Fi ; The time it takes for the valve disc to return to its seat from full opening is T i ; Among them, the initial value of i is 1;

[0010] S5: Based on the result of step S4, according to the streamline diagram obtained in step S2, the time t is obtained. i The streamline diagram of the flow channel in the valve is determined at H Fi ≤H≤H in In the range, the streamline direction in the area where the valve disc faces the fluid flow side is selected to execute S61 or S62;

[0011] S61: If there is a streamline that goes from the lower part of the valve disc to the valve outlet, execute step S7;

[0012] S62: If all streamlines are turned upward to the upper part of the valve disc, the optimization process ends and step S8 is executed;

[0013] S7: Define ΔD = 0.05D1, update the three-dimensional model of the gate valve disc so that D i +1 = D i -ΔD, and re-execute the operations of steps S1 to S5 in sequence; then set i=i+1;

[0014] S8: Let j = i, calculate η = (T1-T j ) / T1*100%, to evaluate the optimization effect of the gate valve disc profile.

[0015] Preferably, in step S1, the flow channel model in the valve is discretized into a mesh model by meshing software; the meshing software is one or more of ANSYS mesh, icem, fluent meshing, TurboGrid, gambit, and HyperMesh.

[0016] Preferably, the dynamic mesh method is one or more of smoothing, layering, and remeshing; if the dynamic mesh method adopts smoothing and / or remeshing, it is necessary to reconstruct the mesh, evaluate the overall initial mesh, and specify the maximum skewness, minimum mesh length, and maximum mesh length.

[0017] Preferably, the software for establishing the three-dimensional model of the gate valve is one or more of UnigraphicsNX, SolidWorks, AutoCAD, Creo, CATIA, Pro / Engineer, and Cimatron.

[0018] Preferably, the fluid analysis software is one or more of ANSYS Fluent, ANSYS CFX, Comsol, XFLOW, shonDy, AICFD, and CLABSO.

[0019] Preferably, in step S1, if the gate valve is symmetrical along the longitudinal cross-section, the extracted valve internal flow channel model is a half volume surrounded by the valve symmetry plane, the valve inlet, the valve outlet, the valve body inner surface, and the outer surface of the valve core and valve seat; if the valve body is not symmetrical along the longitudinal cross-section, the extracted valve internal flow channel model is a full volume surrounded by the valve inlet, the valve outlet, the valve body inner surface, and the outer surface of the valve core and valve seat; the longitudinal cross-section is a plane where the line connecting the inlet center point and the outlet center and the valve centerline are located.

[0020] Preferably, in the optimization method, if the gate valve only allows one-way flow, only the valve disc profile facing the fluid flow needs to be optimized; if the gate valve allows two-way flow, both valve disc profiles need to be optimized.

[0021] Furthermore, if the gate valve allows bidirectional flow and is symmetrical along the longitudinal side section, then after the optimization of one side of the valve disc profile is completed, its symmetric surface is optimized to the same profile, and the total optimization process is one time; if the gate valve allows bidirectional flow and is not symmetrical along the longitudinal side section, it is necessary to optimize both sides of the valve disc separately, and the total optimization process is two times; the longitudinal side section is a plane that is perpendicular to the longitudinal front section and where the center axis of the valve is located.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention realizes the rapid closing function of a large flow gate valve, reduces the closing response time, and improves the safety performance of the system;

[0024] (2) The present invention adopts a valve disc parametric design method, and quantitatively obtains the optimal solution for reducing the gate valve response time structural parameters according to the existing structure and flow conditions of the gate valve disc, thereby ensuring that the optimal performance of the gate valve is achieved under the existing conditions;

[0025] (3) The valve flap design method based on numerical simulation of the present invention can quickly evaluate the closing response time of the gate valve and perform valve flap profile design, thus avoiding tedious and complicated theoretical calculations and experimental corrections, and providing new ideas for the optimal design of industrial gate valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional model of the gate valve in Example 1;

[0027] Figure 2 is the grid model of the gate valve in Example 1;

[0028] Figure 3 It is a half-section two-dimensional drawing and parameter schematic diagram of the gate valve in Example 1;

[0029] FIG4 is a streamline diagram of the symmetric surface of the flow channel model of the gate valve in Example 1 at different optimization stages;

[0030] Figure 5 This is a half-section three-dimensional model of the valve disc after the gate valve is optimized in Example 1. DETAILED DESCRIPTION

[0031] To make it easier to understand, the entire optimization process will be described in detail below in combination with valve disc optimization examples and simulation diagrams. Obviously, the following optimization example is only one of the optimization methods based on the content disclosed by the present invention. Before technical workers in other valve fields produce innovative results, all optimization solutions implemented based on the present invention fall within the protection scope of the present invention.

[0032] The present invention provides a method for optimizing the gate valve disc profile that can accelerate closing. The gate valve structure optimized by this method can greatly reduce the response time of the gate valve from full opening to full closing, improve the performance of the gate valve; avoid most assumptions and complex calculations, make the results more reliable; reduce design costs, and avoid repeated manufacturing of prototypes for testing. The specific implementation plan of the optimization method of the present invention is as follows:

[0033] S1: According to steps 1) to 5) in sequence:

[0034] 1) According to the engineering drawings, use the modeling software to establish a three-dimensional model of the gate valve to be optimized. The valve opening of the initial model of the gate valve is the maximum, and the gate valve position is set as a variable parameter.

[0035] 2) Extract the valve internal flow channel model based on the internal flow channel of the three-dimensional model. If the gate valve is symmetrical along the longitudinal cross-section, the extracted valve internal flow channel model is the half volume surrounded by the valve symmetry plane, valve inlet, valve outlet, valve body inner surface, and valve core and valve seat outer surface; if the valve body is not symmetrical along the longitudinal cross-section, the extracted valve internal flow channel model is the full volume surrounded by the valve inlet, valve outlet, valve body inner surface, and valve core and valve seat outer surface. The above longitudinal cross-section is the plane where the line connecting the inlet center point and the outlet center and the valve centerline are located.

[0036] 3) Use meshing software to discretize the flow channel model inside the valve into a suitable mesh model.

[0037] 4) Through the fluid analysis software, according to the design drawings of the valve, the fluid properties of the medium in the valve are assigned to the entire space inside the flow channel model in the valve; the boundary conditions of the inlet and outlet of the flow channel model are set; the vertical downward mechanical transmission force on the valve stem is defined and input, and the height of the lower end of the valve disc from the bottom of the valve seat is set as the dependent variable; the turbulence model for fluid calculation is set; the outer wall surface of the valve disc is set as a fixed slip surface, and the outer wall surface of the valve stem and the symmetry surface are set as reconstruction surfaces.

[0038] 5) Set the dynamic mesh method, update step size and monitoring time point to obtain a dynamic mesh model. The dynamic mesh method used is one or more of Smoothing, Layering and Remeshing. If Smoothing and / or Remeshing require mesh reconstruction, evaluate the overall initial mesh and specify the maximum skewness, minimum mesh length and maximum mesh length.

[0039] S2: According to the operation method of S1, the above dynamic grid model is calculated by fluid analysis software. After the calculation converges, proceed in sequence according to steps 1) to 4):

[0040] 1) Output the entire process, i.e. the time it takes for the valve disc to go from fully open to returning to its seat;

[0041] 2) Output the downward displacement, velocity and acceleration of the outer wall of the valve disc;

[0042] 3) Outputting the fluid velocity data in the above-mentioned full-process flow channel model;

[0043] 4) Output the data of hydraulic force distribution on the outer surface of the valve disc impacted by the fluid;

[0044] 5) Through post-processing software, draw the velocity cloud map on the longitudinal symmetry plane of the grid model that changes with time, and draw the streamline diagram based on the time-velocity cloud map.

[0045] S3: Define two sets of variables:

[0046] 1) The projected height from a point in the gate valve 3D model to the valve seat is H, and the height of the top of the inlet flow channel is a constant H in ;

[0047] 2) According to the downward displacement, velocity and acceleration data of the outer wall of the valve disc obtained by the fluid analysis software in S2, it is obtained that when the valve disc acceleration is the maximum, the time is t i The height H between the lower end of the valve disc and the bottom of the valve seat Pi .

[0048] The initial value of i above is 1.

[0049] S4: Define two sets of variables:

[0050] 1) Based on S2 and S3, according to the data of hydraulic force distribution on the outer surface of the valve disc impacted by the fluid, the height H of the lower end of the valve disc from the bottom of the valve seat is obtained. Pi When the valve disc is subjected to the impact force of the fluid medium, the resultant force point position A 合 , and the distance from the resultant point to the central axis is D i , the projected height to the bottom of the valve seat is H Fi ;

[0051] 2) The time it takes for the valve disc to return to its seat from full opening is T i .

[0052] The initial value of i above is 1.

[0053] S5: Based on S2 and S4, according to the streamline diagram, the streamline diagram of the flow channel in the valve at time ti is obtained, and the Fi ≤H≤H in Within the range, the streamline direction in the area of ​​the valve disc facing the fluid flow side is selected to execute S61 or S62.

[0054] S61: According to step S5, if H Fi ≤H≤H inIf there is a streamline direction from the lower part of the valve disc to the valve outlet within the range, execute S7.

[0055] S62: According to step S5, if H Fi ≤H≤H in If all streamlines are strictly turned upward to the upper part of the valve disc within the range, the optimization process is terminated.

[0056] S7: Define ΔD = 0.1D1, update the three-dimensional model of the gate valve disc so that D i +1 = D i -ΔD, and re-execute the operations of S1 to S5 in sequence, with i=i+1, until the optimization process is completed.

[0057] In the above optimization process,

[0058] 1) If the gate valve only allows one-way flow, only the disc profile facing the fluid flow side needs to be optimized, and the above S1 to S7 are performed once;

[0059] 2) If the gate valve allows bidirectional flow and the gate valve is symmetrical along the longitudinal side section, after the optimization of the disc profile on one side is completed, its symmetric surface is changed to the same profile, and the above S1 to S7 are executed once;

[0060] 3) If the gate valve allows bidirectional flow and the gate valve is not symmetrical along the longitudinal side section, the two sides of the valve disc need to be optimized separately, and the above S1 to S7 are performed twice.

[0061] The above-mentioned longitudinal side section is a plane that is perpendicular to the longitudinal front section and on which the center axis of the valve is located.

[0062] After all optimization processes are completed, let j = i and calculate η = (T1-T j ) / T1*100%, and the optimization effect is evaluated thereby.

[0063] During the optimization process, the valve 3D model was established based on one or more of the following software: UnigraphicsNX, SolidWorks, AutoCAD, Creo, CATIA, Pro / Engineer, Cimatron. The mesh was divided based on one or more of the following software: ANSYS mesh, icem, fluent meshing, TurboGrid, gambit, HyperMesh. The software used for computational fluid dynamics was one or more of the following: ANSYS Fluent, ANSYS CFX, Comsol, XFLOW, shonDy, AICFD, CLABSO.

[0064] Example 1

[0065] Take a double-gate gate valve with symmetrical longitudinal and lateral structures and one-way flow as an example. According to the engineering drawings, a three-dimensional model of the gate valve is established based on the modeling software SolidWorks. Figure 1 According to the internal flow channel of the three-dimensional model, the valve internal flow channel model is extracted, and the model is a half volume surrounded by the valve symmetry surface, valve inlet, valve outlet, valve body inner surface, and valve core and valve seat outer surface.

[0066] Based on the meshing software ANSYS mesh, the flow channel model in the valve is discretized into a suitable mesh model, such as Figure 2 As shown. Through the fluid analysis software ANSYS Fluent, the properties of normal temperature water are assigned to the entire space inside the flow channel model in the valve; the velocity boundary conditions of the inlet and outlet of the flow channel model are set; the vertical downward mechanical transmission force on the valve stem is defined and input using UDF, and the height of the lower end of the valve disc from the bottom of the valve seat is set as the dependent variable; the turbulence model for fluid calculation is set to the Standard k-ε model; the outer wall surface of the valve disc is set as a fixed slip surface, and the outer wall surface and symmetry surface of the valve stem are set as reconstruction surfaces. Set the dynamic mesh method, update step size, and monitoring time point. The dynamic mesh methods used are Smoothing and Remeshing, evaluate the overall initial mesh and specify the maximum skewness, minimum mesh length, and maximum mesh length.

[0067] The above dynamic mesh model is calculated by the fluid analysis software ANSYS mesh. After the calculation converges, the following outputs are produced: the whole process, i.e. the time taken for the valve disc to be fully opened and then returned to its seat; the downward displacement, velocity, and acceleration of the outer wall of the valve disc; the fluid velocity data in the above full process flow channel model; and the data on the hydraulic force distribution on the outer surface of the valve disc impacted by the fluid. The velocity cloud diagram of the mesh model changing with time is drawn by post-processing software, and the streamline diagram is drawn based on the time-velocity cloud diagram.

[0068] like Figure 3 As shown in the figure, define the variables: the projection height from a point in the gate valve 3D model to the valve seat is H, and the height of the top of the inlet flow channel is a constant H in According to the downward displacement, velocity and acceleration data of the outer wall of the valve disc, the time when the valve disc acceleration is the largest is t i The height H between the lower end of the valve disc and the bottom of the valve seat Pi According to the flow hydraulic data of the outer surface of the valve disc facing the flow, the height H of the lower end of the valve disc from the bottom of the valve seat is obtained. Pi When the valve disc is subjected to the impact force of the fluid medium, the resultant force point position A 合 , and the distance from the resultant point to the central axis is D i , the projected height to the bottom of the valve seat is H Fi ; The time it takes for the valve disc to return to its seat from full opening is T i . The initial value of i above is 1.

[0069] According to the streamline diagram, the streamline diagram of the flow channel in the valve at time t1 is obtained, and the flow rate at H F1 ≤H≤H in The valve disc in the range faces the streamline of the flow surface, as shown in Figure 4(1). F1 ≤H≤H in Within the range, there is a detour from the lower part of the valve disc to the valve outlet. Define ΔD = 0.1D1, update the three-dimensional model of the gate valve disc, so that D i +1 = D i -ΔD, re-execute all the above operations in sequence, i=2.

[0070] ..., re-execute all the above operations in sequence, i=3.

[0071] ..., when i = 4, the streamline diagram inside the valve at time t4 is shown in Figure 4 (2). F4 ≤H≤H in Within the range, there is a streamline direction from the lower part of the valve disc to the valve outlet. Re-perform all the above operations in sequence, i = 4.

[0072] ..., re-execute all the above operations in sequence, i=5.

[0073] ..., re-execute all the above operations in sequence, i=6.

[0074] ..., when i = 7, the streamline diagram inside the valve at time t7 is shown in Figure 4 (3). F7 ≤H≤H in Within the range, all streamlines are strictly turned upward to the upper part of the valve disc, and the optimization process is completed. The half-section 3D model of the valve disc after optimization is as follows: Figure 5 shown.

[0075] Since the double-gate gate valve is a one-way flow valve, multiple optimizations are not required. Calculating η = (T1-T7) / T1*100%, η = 35.8% is obtained, indicating that the optimization effect of this implementation case is good and the gate valve closing performance is significantly improved.

[0076] Compared with traditional optimization methods, the present invention applies numerical simulation to gate valve optimization, which has the following two advantages: the optimization is intuitive, and the model parameters can be quickly changed and the effects before and after optimization can be compared, avoiding most assumptions and making the results more reliable; the cost is low, and repeated prototype manufacturing and testing can be avoided, greatly reducing the economic time cost.

[0077] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A method for optimizing the valve disc profile of a gate valve capable of accelerating closing, characterized in that: The details are as follows: S1: Establish a three-dimensional model of the gate valve to be optimized when the valve opening is maximum, extract the flow channel model in the valve and discretize it into a grid model; use fluid analysis software, based on the grid model, assign fluid properties to the medium in the valve, set inlet and outlet boundary conditions, take the vertical downward mechanical transmission force on the valve stem as the independent variable, set the height of the lower end of the valve disc from the bottom of the valve seat as the dependent variable, set the turbulence model for fluid calculation, set the outer wall surface of the valve disc as the fixed slip surface, and the outer wall surface and symmetry surface of the valve stem as the reconstruction surface, set the dynamic grid method, update step size and monitoring time point, and obtain the dynamic grid model; S2: Calculate the dynamic mesh model through fluid analysis software, and after the calculation converges, output the following content: the time taken for the valve disc to return to its seat, the downward displacement, velocity and acceleration of the outer wall of the valve disc, the fluid velocity data in the flow channel during the whole process, and the hydraulic force distribution data on the outer surface of the valve disc impacted by the fluid; draw a velocity cloud map on the longitudinal symmetry plane of the mesh model that changes with time through post-processing software, and draw a streamline map based on the velocity cloud map that changes with time; S3: Define the projection height from a point in the gate valve 3D model to the valve seat as H, and the height of the top of the inlet flow channel as a constant H in According to the downward displacement, velocity and acceleration of the outer wall of the valve disc obtained in step S2, the time when the valve disc acceleration is the maximum is t i The height H between the lower end of the valve disc and the bottom of the valve seat Pi , where the initial value of i is 1; S4: Based on the results of steps S2 and S3, when the time is t i According to the data of hydraulic force distribution on the outer surface of the valve disc impacted by the fluid, the height H of the lower end of the valve disc from the bottom of the valve seat is obtained. Pi When the valve disc is subjected to the impact force of the fluid medium, the resultant force point position A 合 ; The distance from the resultant point to the central axis is D i , the projected height to the bottom of the valve seat is H Fi ; The time it takes for the valve disc to return to its seat from full opening is T i ; Among them, the initial value of i is 1; S5: Based on the result of step S4, according to the streamline diagram obtained in step S2, the time t is obtained. i The streamline diagram of the flow channel in the valve is determined at H Fi ≤H≤H in In the range, the streamline direction in the area of ​​the valve disc facing the fluid flow side is selected to execute S61 or S62; S61: If there is a streamline that goes from the lower part of the valve disc to the valve outlet, execute step S7; S62: If all streamlines are turned upward to the upper part of the valve disc, the optimization process ends and step S8 is executed; S7: Define ΔD = 0.05D1, update the three-dimensional model of the gate valve disc so that D i +1 = D i -ΔD, and re-execute the operations of steps S1 to S5 in sequence; then set i=i+1; S8: Let j = i, calculate η = (T1-T j ) / T1*100%, to evaluate the optimization effect of the gate valve disc profile.

2. The method for optimizing the valve disc profile of a gate valve capable of accelerating closing according to claim 1, characterized in that: In the step S1, the flow channel model in the valve is discretized into a mesh model by meshing software; the meshing software is one or more of ANSYS mesh, icem, fluent meshing, TurboGrid, gambit, and HyperMesh.

3. The method for optimizing the valve disc profile of a gate valve capable of accelerating closing according to claim 1, characterized in that: The dynamic mesh method is one or more of a smoothing method, a layer-laying method, and a local redrawing model; if the dynamic mesh method adopts a smoothing method and / or a local redrawing model, it is necessary to reconstruct the mesh, evaluate the overall initial mesh, and specify the maximum skewness, minimum mesh length, and maximum mesh length.

4. The method for optimizing the valve disc profile of a gate valve capable of accelerating closing according to claim 1, characterized in that: The software for establishing the three-dimensional model of the gate valve is one or more of UnigraphicsNX, SolidWorks, AutoCAD, Creo, CATIA, Pro / Engineer, and Cimatron.

5. The method for optimizing the valve disc profile of a gate valve capable of accelerating closing according to claim 1, characterized in that: The fluid analysis software is one or more of ANSYS Fluent, ANSYS CFX, Comsol, XFLOW, shonDy, AICFD, and CLABSO.

6. The method for optimizing the valve disc profile of a gate valve capable of accelerating closing according to claim 1, characterized in that: In step S1, if the gate valve is symmetrical along the longitudinal cross-section, the extracted valve internal flow channel model is a half volume surrounded by the valve symmetry plane, the valve inlet, the valve outlet, the valve body inner surface, and the outer surface of the valve core and valve seat; if the valve body is not symmetrical along the longitudinal cross-section, the extracted valve internal flow channel model is the full volume surrounded by the valve inlet, the valve outlet, the valve body inner surface, and the outer surface of the valve core and valve seat; the longitudinal cross-section is the plane where the line connecting the inlet center point and the outlet center and the valve centerline are located.

7. The method for optimizing the valve disc profile of a gate valve capable of accelerating closing according to claim 1, characterized in that: In the optimization method, if the gate valve allows only one-way flow, only the valve disc profile facing the fluid flow needs to be optimized; if the gate valve allows two-way flow, both valve disc profiles need to be optimized.

8. The method for optimizing the valve disc profile of a gate valve capable of accelerating closing according to claim 7, characterized in that: If the gate valve allows bidirectional flow and is symmetrical along the longitudinal side section, then after one side of the valve disc profile is optimized, its symmetric surface is optimized to the same profile, and the total optimization process is one time; if the gate valve allows bidirectional flow and is not symmetrical along the longitudinal side section, it is necessary to optimize both sides of the valve disc separately, and the total optimization process is two times; the longitudinal side section is a plane that is perpendicular to the longitudinal front section and where the center axis of the valve is located.

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